import struct


file_inf_struct = "qq"
group_head_struct = "qqqI"
collect_fmt = "Bqqqqqqqq"
col_set_fmt = "Bqqqqqqqq"
i_data_fmt = "Bqqqq"
safe_fmt = "IIIq"
file_inf_size = struct.calcsize(file_inf_struct)
group_head_size = struct.calcsize(group_head_struct)
collect_fmt_size = struct.calcsize(collect_fmt)
safe_fmt_size = struct.calcsize(safe_fmt)
